simdzone by NLnet Labs
Fast and standards compliant DNS presentation format parser.
DNS resource records (RRs) can be expressed in text form using the presentation format. The format is most frequently used to define a zone in master files, more commonly known as zone files, and is best considered a concise tabular serialization format with provisions for convenient editing.
The format is originally defined in RFC 1035#section-5 and RFC 1034#section-3.6.1, but as the DNS is intentionally extensible, the format has been extended over time.